US3582779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for improving the homogeneity of magnetic fields
Assignee: Varian Medical Systems Inc
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Filing: 1966-01-20
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Granted: 1971-06-01
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Expires: 1986-01-20
Abstract
Abstract Coil configurations for improving the homogeneity of a certain volume of magnetic field by removing certain undesired second order magnetic field gradients including three spaced-apart current loops, each of the current loops being substantially coaxially disposed, a first of the current loops being disposed enveloping centrally the certain volume of magnetic field, the second and third current loops being bucking connected with respect to the first current loop and disposed straddling the certain volume of magnetic field, the second and third current loops have substantially equal turns, and the first current loop has approximately 0.7 times the turns of each of said second and third coils.
Inventors
- 👤 Arnold L Bloom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:28
CPC Classifications
H; H01; H01F; H01F5/00; G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/38; G01R33/387; G01R33/3875; H01F7/00; H01F7/06; H01F7/20; H01F7/202
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
111 words
Apparatus for improving the homogeneity of a certain volume of magnetic field by removing certain undesired second order magnetic field gradients including, means for providing three spaced-apart current loops, each of said current loops being substantially coaxiaLly disposed, a first of said current loops being disposed enveloping centrally the certain volume of magnetic field, said second and third current loops being bucking-connected with respect to said first current loop and disposed straddling the certain volume of magnetic field, said second and third current loops adapted to have substantially equal turns, and said first current loop adapted to have approximately 0.7 times the turns of each of said second and third coils.
Claim 2
Dependent Claim
111 words
Apparatus for improving the homogeneity of a certain volume of magnetic field by removing certain undesired second order magnetic field gradients including, means for providing three spaced-apart current loops, each of said current loops being substantially coaxiaLly disposed, a first of said current loops being disposed enveloping centrally the certain volume of magnetic field, said second and third current loops being bucking-connected with respect to said first current loop and disposed straddling the certain volume of magnetic field, said second and third current loops adapted to have substantially equal turns, and said first current loop adapted to have approximately 0.7 times the turns of each of said second and third coils.
Claim 3
Dependent Claim
58 words
The apparatus according to claim 1 including means for energizing said first, second and third current loops, and said second and third current loops adapted to have substantially equal ampere turns when energized, and said first current loop adapted to have substantially 0.7 times the ampere turns of each of said second and third current loops when energized.
Claim 4
Dependent Claim
109 words
Apparatus for improving the homogeneity of a certain volume of magnetic field by removing certain undesired second order magnetic field gradients including, means for providing a first three pairs of additive connected current loops, each of said current loop pairs disposed straddling the certain volume of magnetic field and defining a loop pair axis by a straight line interconnecting the geometric centers of both of said current loops, and the axis of said current loop pairs being angularly spaced approximately 60* apart from each other, and one of said current loop pairs adapted to have approximately 1.2 times the turns of each of the other two current loop pairs.
Claim 5
Dependent Claim
109 words
Apparatus for improving the homogeneity of a certain volume of magnetic field by removing certain undesired second order magnetic field gradients including, means for providing a first three pairs of additive connected current loops, each of said current loop pairs disposed straddling the certain volume of magnetic field and defining a loop pair axis by a straight line interconnecting the geometric centers of both of said current loops, and the axis of said current loop pairs being angularly spaced approximately 60* apart from each other, and one of said current loop pairs adapted to have approximately 1.2 times the turns of each of the other two current loop pairs.
Claim 6
Dependent Claim
41 words
The apparatus according to claim 3 including means for energizing said current loop pairs, and one of said current loop pairs adapted to have approximately 1.2 times the ampere turns of each of the other two current loop pairs when energized.
Claim 7
Dependent Claim
94 words
Apparatus for improving the homogeneity of a certain volume of magnetic field by removing certain undesired second order magnetic field gradients including, means for providing three pairs of additive connected current loops, each of said pairs of current loops being approximately coaxially disposed and defining a loop pair axis by a straight line interconnecting the geometric centers of both of said current loops, and the axes of said current loop pairs being angularly spaced approximately 60* apart from each other, each of said current loop pairs disposed straddling the certain volume of magnetic field.
Claim 8
Dependent Claim
94 words
Apparatus for improving the homogeneity of a certain volume of magnetic field by removing certain undesired second order magnetic field gradients including, means for providing three pairs of additive connected current loops, each of said pairs of current loops being approximately coaxially disposed and defining a loop pair axis by a straight line interconnecting the geometric centers of both of said current loops, and the axes of said current loop pairs being angularly spaced approximately 60* apart from each other, each of said current loop pairs disposed straddling the certain volume of magnetic field.
Claim 9
Dependent Claim
34 words
The apparatus according to claim 5 including means for energizing said three pairs of current loops, and all of said three pairs of current loops adapted to have substantially equal ampere turns when energized.
Claim 10
Dependent Claim
86 words
Apparatus for improving the homogeneity of a certain volume of magnetic field by removing certain undesired second order magnetic field gradients including, means for providing a first four pairs of coaxial current loop pairs, each of said four current loop pairs disposed straddling the certain volume of magnetic field and defining a loop pair axis by a straight line interconnecting the geometric centers of both of said current loops, and the axes of said current loop pairs being angularly spaced approximately 70* apart from each other.
Claim 11
Dependent Claim
86 words
Apparatus for improving the homogeneity of a certain volume of magnetic field by removing certain undesired second order magnetic field gradients including, means for providing a first four pairs of coaxial current loop pairs, each of said four current loop pairs disposed straddling the certain volume of magnetic field and defining a loop pair axis by a straight line interconnecting the geometric centers of both of said current loops, and the axes of said current loop pairs being angularly spaced approximately 70* apart from each other.
Claim 12
Dependent Claim
32 words
The apparatus according to claim 4 including means for energizing said four current loop pairs, and all of said four current loop pairs adapted to have substantially equal ampere turns when energized.
Claim 13
Dependent Claim
99 words
The apparatus according to claim 7 including, means for providing a second four pairs of spaced aiding-connected current loops, each of said second four pairs of current loops disposed straddling the certain volume of magnetic field and defining a loop pair axis by a straight line interconnecting the geometric centers of both of said current loops, and the axes of said second current loop pairs being angularly spaced approximately 70* apart from each other, and the axes of said second four pairs of current loops disposed approximately 35* to the axes of said first four pairs of current loops.
Claim 14
Dependent Claim
34 words
The apparatus according to claim 9 including means for energizing said second four current loop pairs, and all of said second four current loop pairs adapted to have substantially equal ampere turns when energized.
References Cited (Backward Citations)
US3515979A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |